Assassin's Creed is beautiful & fun, but repetitive.
Oblivion is a good buy...lot of hours of gameplay.
Don't have the other ones.
Some probably have demos up on PSN you can try out--I know Stranglehold did...the demo was pretty fun.
Some you didn't name that you oughta check out too are Ratchet & Clank, Warhawk, Uncharted, & Rock Band.
PSN ID: Sorrow880
Gamertag: Sorrow80
Wii #: 8132 1076 3416 7450